update CHANGES log

Author: wang

CHANGES.md

@@ -11,6 +11,7 @@ Release Notes.
 * Agent kernel services could be not-booted-yet as ServiceManager#INSTANCE#boot executed after agent transfer
   initialization. Delay so11y metrics#build when the services are not ready to avoid MeterService status is not
   initialized.
+* Fix retransform failure when enhancing both parent and child classes.
 
 All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/236?closed=1)